Carpometacarpal Joints

Question 1

Type of Joint

Answer 1

Synovial biaxial saddle between anteroposteriorly concave surface of trapezium and transversely convex and reciprocally curved base of MC1 capable of 3 degrees of freedom:

• flex/ext
• abd/add
• opposition

Question 2

Supporting Ligaments

Answer 2

Radiocarpal- thickens capsule laterally
-between lat surfaces of trapezium and MC1

Ant/Post Oblique- thickens laterally

• from trapezium onto med side of MC
• ant becomes taut during ext, post during flex